Studies On The Relationship Between The Soils Of Different Parent Rock And The Growth Of Gleditsia Sinensis Lam Young Trees

By means of the method of experimental ecology ,the author studies the Gleditsia sinensis Lam growth on the six different parent rocks ,the results show that the height and diameter of Gleditsia sinensis Lam are significantly difference in six soils, and the changes are more and more obvious with time changing among the different parent rocks.The three years'results indicate that the Limy dolomite is the best for the growth of Gleditsia sinensis and the quartzy sandstone is the worst. The year's growth dynamics of height and diameter for Gleditsia sinensis present the "slow-fast-slow"tendency, the characters display consistently among the six different parent rocks.The nutritive elements in both six soilsof different parent rocks and plant are all obvious changed and are on the drop tendency with seasonal variation, the nutrition contents are high in the initial growth period low in middle stage and recover in last stage ,but the changing ranges are different obviously for diffenent parent rocks.The total nitrogen contents in soils increase slightly among the diffenent parent rocks with the seasonal variation. The soil enzymes don't change obviously in soils, but they increase with the seasonal variation.By analyzing the height diamerer of the Gleditsia sinensis Lam and the soil's nutritive,the result show that the significant or most significant...